Joint spatial-spectral feature space clustering for speech activity detection from ecog signals

Vasileios G. Kanas, Iosif Mporas, Heather L. Benz, Kyriakos N. Sgarbas, Anastasios Bezerianos, Nathan E. Crone

Research output: Contribution to journalArticlepeer-review

Abstract

Brain-machine interfaces for speech restoration have been extensively studied for more than two decades. The success of such a system will depend in part on selecting the best brain recording sites and signal features corresponding to speech production. The purpose of this study was to detect speech activity automatically from electrocorticographic signals based on joint spatial-frequency clustering of the ECoG feature space. For this study, the ECoG signals were recorded while a subject performed two different syllable repetition tasks. We found that the optimal frequency resolution to detect speech activity from ECoG signals was 8 Hz, achieving 98.8% accuracy by employing support vector machines as a classifier. We also defined the cortical areas that held the most information about the discrimination of speech and nonspeech time intervals. Additionally, the results shed light on the distinct cortical areas associated with the two syllables repetition tasks and may contribute to the development of portable ECoG-based communication.

Original languageEnglish (US)
Article number6705641
Pages (from-to)1241-1250
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume61
Issue number4
DOIs
StatePublished - Apr 2014

Keywords

  • Brain-machine interfaces (BMIs)
  • electrocorticography (ECoG)
  • feature space clustering
  • speech activity detection

ASJC Scopus subject areas

  • Biomedical Engineering

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